The Square Enix e-Store (Japan) has opened pre-orders for handkerchiefs inspired by Sora, Riku, and Kairi from Kingdom Hearts III! Roxas's iconic checkered design has also been implemented into a hadkerchief. Each handkerchief, along with featuring the characters' designs, also comes with a small charm representative of each character. They can be pre-ordered for ¥3,456 (approx. $32). They will release on April 20, 2019.
See them in the gallery below!